Room temperature phase-selective synthesis of metastable lead chromium oxides

摘要

The salt metathesis reaction between lead(II) salts and potassium chromate in methanolic solution, mediated by the formation of a soluble complex of potassium chromate with a cyclic polyether, affords orthorhombic PbCrO_4 rather than the monoclinic modification formed in aqueous solution. When the aqueous metathesis reaction is carried out in the presence of tetiary amines, a lead oxide-rich phase, PbO centre dot PbCrO_4 (Pb_2CrO_5,) is selectively formed.